Question

A train sounds its horn as it approaches an intersection. The horn can just be heard at a level of 53 dB by an observer 11 km away.
(a) What is the average power generated by the horn?
A train sounds its horn as it approaches an intersection. The horn can just be heard at a level of 42.0 dB by an observer 10.0 km away.
(a) What is the average power generated by the horn?
W

(b) What intensity level of the horn's sound is observed by someone waiting at an intersection 60.0 m from the train? Treat the horn as a point source and neglect any absorption of sound by the air.
dB

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